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Formulas for Number of Decodes
MS-820 Industrial Bar Code Scanner User’s Manual A-27
Appendices
Appendix L — Formulas for Number of Decodes
To ensure reliable scanning, apply a minimum of five decodes to each bar code. Use
the formulas below to calculate the number of decodes that your label will receive.
If the number of decodes you derive from one of these calculations is less than the
minimum for your application, plug in the minimum number of decodes (5) and solve
for another parameter that might be changed, such as label speed or scans per sec-
ond.
Note: While the formulas given here solve for the predicted number of decodes, you
may also use the formulas to solve for other parameters that might be changed, such
as label speed, label length, etc.
Single Line Ladder Calculation
For single scan line ladder scanning, use the following for-
mula:
1
LH (Label Height) (ladder formula only) is a measurement of
the height of individual bars.
LS (Label Speed) is the distance per second that a bar code
moves through the scan.
DR (Decode Rate) is the number of decodes per second that
a given bar code receives (as derived from a stationary scan test in Appendix K —
“Test Decode Rate” on page A-26).
Example 1:
1. The -3 component in the formula is included to allow for AGC acquisition, an incomplete first
scan, and an incomplete last scan. This applies only if the number inside the parentheses equals
4 or more. If the number equals 3, then only subtract 2 to derive 1 good scan.
Direction of label travel
Scan Line
Figure A-8 Ladder
LH
LS
--------
DR×
3– NS (number of decodes)=
LH 1 inch=
LS 100 inches per second=
DR 900 scans per second=
ND
1
100
---------
900×
=3– 6 complete decodes=
- Industrial 1
- Bar Code Scanner 1
- User's Manual 1
- Table of Contents 4
- List of Figures 8
- List of Tables 9
- About This Manual 10
- Host Communications 10
- Keystrokes 10
- Approvals 10
- Safety Labels 11
- Warning and Caution Summary 12
- Quick Start 13
- Step 1 — Hardware Required 14
- Step 2 — Connect the System 15
- Step 3 — Install ESP-MP 16
- Step 4 — Select Scanner Model 17
- 1–Quick Start 18
- Chapter 1 Quick Start 19
- Communications 25
- Communications by ESP 26
- Communications 27
- Host Port Parameters 28
- RS422 Status 29
- Auxiliary Port 30
- Tra ns par en t Mode 31
- Half Duplex Mode 32
- Full Duplex Mode 33
- Daisy Chain Mode 34
- 2–Communications 38
- Protocol 39
- Protocol by ESP 40
- Protocol by Serial Command 40
- Protocol 41
- Protocol by Embedded Menu 41
- Point-to-Point with RTS/CTS 43
- Polling Mode D 43
- User Defined Point-to-Point 44
- User Defined Multidrop 46
- Response Timeout 48
- Intercharacter Delay 49
- Output Data Format 50
- Postamble Characters 51
- 3–Protocol 52
- Read Cycle/Trigger 53
- Read Cycle/Trigger by ESP 54
- Read Cycle/Trigger 55
- Trigger Mode 56
- Continuous Read 1 Output 57
- External Trigger Level 58
- External Trigger Edge 59
- Serial Data 60
- Serial Data or External Edge 60
- Trigger Filter Duration 61
- Good Decode Reads 61
- External Trigger State 62
- 4–Read Cycle/Trig 64
- Timeout Duration 65
- Multilabel 66
- Number of Labels 67
- Multilabel Separator 68
- Code Types by ESP 70
- Code Types by Serial Command 71
- Code Types by Embedded Menu 72
- Narrow Margins 73
- Symbology ID 74
- Background Color 75
- Code 39 Status 76
- Check Digit Status (Code 39) 76
- Check Digit Output (Code 39) 76
- Fixed Code Length (Code 39) 77
- Full ASCII Set (Code 39 78
- Codabar Status 79
- Fixed Code Length (Codabar) 80
- Check Digit Type (Codabar) 81
- Check Digit Output (Codabar) 81
- Interleaved 2 of 5 82
- Chapter 5 Codes 83
- UPC Status 84
- EAN Status 84
- Separator Status (UPC/EAN) 85
- Separator Character (UPC/EAN) 86
- Supplementals Type (UPC/EAN) 86
- PDF417 Status 87
- Fixed Code Length (PDF417) 87
- (PDF417) 88
- Code 128 89
- UCC/EAN-128 90
- Code 93 Status 93
- Fixed Code Length (Code 93) 93
- AIAG Identifiers 95
- Autodiscriminate 96
- Scanner Setup 97
- Scanner Setup by ESP 98
- 6–Scanner Setup 100
- Scanner Type 101
- Scan Speed 102
- Gain Adjustment 103
- AGC Sampling 104
- Scanner Setup 105
- AGC Minimum 105
- AGC Maximum 105
- Transition Counter 106
- Matchcode 107
- Matchcode by ESP 108
- Matchcode by Serial Command 108
- Matchcode 109
- Matchcode by Embedded Menu 109
- Overview of Matchcode 110
- Matchcode Type 111
- Sequential Matching 112
- Match Start Position 112
- Match Length 113
- Wild Card Character 113
- Sequence On Noread 114
- Sequence On Mismatch 115
- Master Label Database 116
- Enter Master Label Data 117
- 7–Matchcode 118
- Delete Master Label Data 119
- New Master Pin 121
- 8–Outputs 123
- Chapter Contents 123
- Outputs by Serial Command 124
- Outputs by Embedded Menu 124
- Outputs 125
- Output Data by ESP Menu 125
- Message Output 126
- Noread Message 127
- Bad Bar Code Message 128
- No Bar Code Message 129
- Bar Code Output 130
- When to Output Bar Code Data 131
- End of Read Cycle 132
- Laser Control 133
- Laser Off Percentage 134
- Serial Verification 135
- Control/Hex Output 136
- Beeper Status 137
- Partial Output 138
- Operation Command Output 139
- Discrete I/0 141
- Discrete I/O by ESP Menu 142
- Discrete I/0 143
- Output 1 144
- Active State 145
- Pulse Width 145
- Number Before Output 145
- Output 2 146
- Output 3 146
- Diagnostics 147
- Diagnostics by ESP Menu 148
- Diagnostics by Serial Command 148
- Diagnostics 149
- Diagnostics by Embedded Menu 149
- Warning Messages 150
- Laser High Warning 151
- Laser Low Warning 152
- NOVRAM Corrupt Warning Status 153
- High Temperature Threshold 154
- Low Temperature Threshold 155
- Lifetime Hours 156
- Powerups 158
- Time Since Last Reset 159
- 10–Diagnostics 160
- Utilities 161
- Utilities by ESP Menu 162
- Utilities 163
- Utilities by Serial Command 163
- 11–Utilities 164
- File Transfer 165
- Counters 166
- Part Number 168
- Checksum 169
- Read Rate 170
- Device Control 172
- Code Type 173
- Appendices 175
- Figure A-1 MS-820 Dimensions 176
- Table A-1 MS-820 Read Ranges 177
- Appendix A 178
- LED Indicators 178
- Safety Certifications 178
- Electrical Specifications 179
- Pin Assignments 179
- Optoisolator Outputs 180
- Optoisolator Inputs 182
- IB-131 Interface Module 183
- Scanner to IB-131 184
- Multidrop 185
- Daisy Chain 185
- Appendix D 186
- Serial Configuration Commands 187
- Serial Command Format 189
- Serial Utility Commands 189
- Control Characters 190
- Appendix F — ASCII Table 191
- Appendix F 192
- Appendix G — Embedded Menus 193
- Defaulting 194
- Appendix H 196
- Initializing 197
- Loss of Communications 197
- Position Object Detector 199
- With a Static Label 200
- Number of Decodes 200
- With a Moving Label 200
- Direction of label travel 201
- Scan Line 201
- Appendix M — Operational Tips 204
- Interface Standards 205
- Appendix O 206
- Multidrop Communications 207
- Polling Sequence 208
- Select Sequence 209
- Glossary of Terms 211
- Appendix P 212
- Wild Card Character 7-7 222
- Windows NT i-ix 222
- Zero Position 6-4 222
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